Major Description
For load command, it should be pretty easy to implement. We already call Hive to load data when insert into Hive tables. So, we can follow the implementation of that. For example, we load into hive table in InsertIntoHiveTable command at https://github.com/apache/spark/blob/master/sql/hive/src/main/scala/org/apache/spark/sql/hive/execution/InsertIntoHiveTable.scala#L221-L225.
